Machine for making piston rings



i EASQN H. R. SEIFERT MACHINE FOR MAKING PIsToN RINGS Filed July 23. 1921 4 Sheets-Sheet l NNN@ 19,1923.

1,459,117 H. R; SEIFERT4 Y MACHINE FOR MAKING PIsToN RINGS Filed July 23, 1921 4 sheets-sheet 2 www June i179,- 1923. www? H. R. SEIFERT MACHINE FOR MAKING PISTON RINGS Filed July 23, 1921 4 sheets-sheet 5 jun@ 119, @923. ESQE'? H. R. SELFERT MACHINE FOR MAKING PIsToN RINGS Filed July 25, 1921 A' ZLSheecs-Sht-et4 2f 2@ E i Patented Alune 19, i923.

unire raras HENRY R. SEIFERT, OF EAST ELLSWQRTH, WISCONSIN.

MACHINE FOR .MAKING EISTON`RNGS.

Appiicaiion ined July 23, 192i. serial no. 437,041.

To al? w/"iom t may concern.

Be it known that I, HENRY R. Snirnn'r, am a citizen of the United States, residing at East Ellsworth, in the county of Pierce and State of TWisconsin, have invented certain new and useful improvements in Machines for Making Piston Rings; and I do hereby declare the following to be a full, clear, and exact description of the invention, suc-h as will enable others skilled in the art to which it appertains to make and use the saine.

My present invention has for its object to provide a highly eflicient machine for nia-king piston rings and process of producing the same. Preferably, the rings used in carrying out the improved process may be primarily formed by the improved process described and broadly claimed in my co-pending application entitled Improved process and apparatus for forming piston rings, filed July 18, 1921, Serial Number L185,686.

To the above end, generally stated, the invention consists of the novel devices and combinations of devices, hereinafter de- F ig. 2 is a right side elevation of the same;

Fi 3 is a front elevation;

0 r u o n Fig. et is a fragmentary detail view in plan of that portion of the machine de signed for use in holding piston rings while reducing the ends thereof by means of a cutting wheel diagrainmatically illustrated by means of broken lines;

Fig. 5 is a side elevation of the parts shown in Fig. 4, certain of said parts being shown in different positions by means of broken lines; n

Fig. 6 is a fragmentary detail view on an enlarged scale of the ring and cutting wheel,

said ring being indicated in different positions b means of broken lines and said cutting w eel being indicated by broken lines;

Fig. 7 is a fragmentary detail. view von an enlarged scale of the rring and milling tool for forming the seats therein, some parts being indicated by means of broken lines;

Fig. 8 is fragmentary detail view in plan of that portion of the machine designed for use in holding rings while forming the seats therein by means of a milling tool;

F ig, 8a is a right side elevation of the parts shown in 8;

Fig. 9 is a vertical section taken line 99 of Figs. 3 and 8;

Fig. 10 is a view principally in section on the Fig. 9;

yFig. 11 is a perspective view of the improved piston ring;

Figs. 12 to 16, inclusive, are fragmentary perspective views illustrating the diffe-rent steps in the process of producing the improved piston ring, as shown in Fig. 11;

Fig. 17 is a plan view showing a modified form of the machine; and

18 is a view `principally in front elevation with some parts sectioned on the line 18-18 of Fig. 17.

The piston ring 2O is provided with offset reduced ends 21 and 22. These reduced ends 2l are quadrantal in cross section and arranged to overlap when the piston ring is compressed and enter said seats, which have y vtransversely concave bottoms formed on the same arcs-as said ends.

Referring now'in detail to the improved machine, the numeral 24 indicates a frame,

- to the top lof which is rigidly secured a cast base 25 having guideways 26 on whichf is mounted a bed 27. This bed 27 is moved wheel-equipped screw 28 rotatively mount- (l5 taken substantially on the line 10-10 of` ed in a. bearing 29 onY the base 25, held there- ,in against'endwise movement and having screw-threaded engagement with said bed.

For cutting the ring 20 to form the reduced ends 21 thereon, l provide a vertically disposed milling or cutting wheel 30 arranged to -rotate in the direction of the movement of the bed 27'and thereabove. This cutting wheel 30 is mounted on an arbor 81 journaled in bearings 32 oln ythe free end of a horizontal bracket 38 pivoted at its rear end to bearings 3%: on the base l25. The front end rof the bracket 33 is supported on a longitudinally vadjustable twopart post 35 for raising or lowering movements to vertically adjust the cutting wheel 30. The two sections of the post 35 are con- 'nected by screw threads and the lower sec- Ytion thereof is rigidly secured to the base 25 and the upper end of the upper section of lll.)

the post is. extended through a bore in the bracket 33 with` freedom for turning movement thereon and is secured thereto by an opposing shoulder and nut.

The cutting tool 30 is driven, in the direction of the arrow marked in Fig. 2, fromy a countershaft 37 by a sprocket chain 38, which runs over aligned sprocket wheels 3.9 on the. arbor 31 and said countershaft. On the left-handend of the countershaft 3 7 is keyed a pulley 40, over which runs a driving, belt, not shown.

To hold the ring 2O while formingthe ref,

ducedl ends 21 thereon, there is provided a horizontally disposed face late 41 intermediately pivoted to a vertica ly movable slide 42 and a bearing bracket 43 carried thereby. On theforward end of the face plate 41 is a handle 44, by which said face plate may be oscillated or held down in a horizontal position on a stop 45 formed with the bearing bracket 43. The slide 42 is mounted in a channel guideway 46 formed in the face of a column 47 with freedom for vertical adjust.- ment. This slide 42 is frictionally clamped'to the column 47 by a nut-equipped bolt 48, which xtendsthrough a, bore in said slide vand a vertical slot 49 in the column 47. Said slide 42v isfurther held and supported by a vertically disposed set screw 50, which di rectly engages the bracket 43 and has screwthreaded; engagement with a lug 51 on the bed 27. By turning the screw 50 when the bolt 48. is loose, the slide 42 may be-.lowered or raised, at will, to set the face plate41 in respect to the cutting wheel 30.

To position a ring, on the face plate 41, in.

the springk 56 i is compressed between f they nut.

on saidbolt'and face plate 41 to yieldingly hold the plate 54A against-the faceplate 41. The stop 53, as shown, is the head of the nut-equipped bolt 57 mounted ini a radial slot 58: in the face plate 41. By adjustingthe bolt 57V in the-slot 58, the stop 53. may bepositioned forrings of different diameters.

After a ring is positioned on the faceplate.

41 in respect to the cutting wheel 30, by the stops 52 and 53, the same is rigidly secured to said face.- plate by aclamping bar 59,'Vse-4 cured at its rear end tothe face plate 4 1'lby a nut-equipped bolt 60 with freedom for raising. and lowering movement in respect to .said face plate.

A washerr 61, o f-'Ssubstantially the same thickness as the width of the ring 20, is placed on the bolt 60 between the face plate 41 and clamping bar 59, and a coiled spring 62 encircling the bolt 60 is compressed between the clamping bar 59 and nut, on said bolt and yieldingly holds said clamping bar on the washer 61. The forward end of the clamping bar 59 is arranged to rest upon that portion of a ring which lies between the stops 52 and 53 and is pressed. thereon by a bolt 63, which extends through. aligned. bores in said clamping bar 59. and. face plate 41 and is provided with a hand-wheel-equipped nut 64. This bolt 63 alsoextends. through a bore in the plate 54 and rigidly secures said plate to the face pla-te. 4i1. Preferably, as shown, the front end: of-z the clamping plate 41 is made concave to substantially follow the contour of the inner faceof a ring held thereby.

To form the seats 22 in the ring 20, there is provided a milling. tool 65 secured by a clutch 66to the left-hand end of the countershaftv 37; ln. forming the seats 22, the ring.

20-is heldby devices in much the same mannerin. which it is held when forming the ends 21, and which devices include a verticallydisposed faceplate 67 mounted for slidingmvement on a column 68 on the bed 27'.` @ntheback of thefaceplate67 is. a vertical. rib 691fitted' in a vertical slot 70 in the column 68, with freedom for endwise sliding .movement For holdingv a ring positioned on the face plate 67, in respect tothe milling tool. 65, fixed and; movable stops 71 and 72, respectively, which correspondto the stops 52 and 53, respectively, on the face plate 41, are pro-v vided. When forming aseat 22 in oneend of the ring 20, the other end thereof is held sprung laterally out ofy alignment therewithl and toward the column 68, to afford clearance for the milling tool 65', by an outstanding lug 72 on the right-hand edge of the face plate 67.

The ring 20is clampedl on the face plate 67,' between-thestops 71 and72, by the upper end of.z avertically disposed clamping bar 7'4, thelower end ofL whichl overlaps the ring atl a diametrically opposite point, and holds said ring Hat against the face' plate 67 andagainst twistingaction produced by the endofA the ring held in offset positions by thelug73. A bolt-75 isprovided for holding the face plate67 in different adjustmentson the column 68 and the clamping bar 74 in assembledrelationtc said face plate. vThis bolt74 extends throughlaligned bores in the intermediate portions of, thefface plate 67 andfclanlipingbar74fand'is provided with a washer-76w-hich spans the slot 70 and engages the back ofthe column 7,6l as abase ofV resistanceufor the bolt7'4. Saidlbolt 72l is of' such length asto permitlateralmovement of the clamping bar 74 and, to yieldingly take up this movement, a coiled spring 77 is provided, which encircles the bolt and 'is compressed between its head and said clamping bar. Obviously, the bolt 75 and the coiled spring 77 yieldingly hold the clamping bar 74 against the ring 20, and the face plate 67 against the column 68.

A variable pressure is applied to the clamping bar 74 to rigidly hold the ring on the face plate67 against the column 68 by means of a bolt 78 having a hand-wheelequipped nut, and which bolt extends through bores in the clamping bar 74 and face plate 67 between the bolt 75 and fixed lug 71. This nut 7 9 reacts against a thimble 8O on the bolt 7 8, and said thimble, in turn,

reacts against a Washer 81, which spans the slot 70 and engages the back of the column 68 as a base of resistance. To position and limit the vertical adjustment of the face plate 67, there is provided a stop 82 in the form of a set screw having screwthreaded engagement with a part on the column 68.

The operation of making piston rings on the above described machine may be briefly described as follows:

As previously stated, the rings are primarily cast endless, as shown inl Fig. 12, and of greater circumference than required, when finished. These endless rings are first placed one at a time on the face plate 41, positioned in respect to the cutting wheel 30 by the stops 52 and 53, and then rigidly secured by the clamping bar 59. The ring is then moved into contact with the cutting wheel 8O by operating the feed screw 28 to move the bed 27 toward the rear of the machine, which cuts a radial notch 20a in one side of the ring, as indicated by broken lines in Fig. 7 and by full lines in Fig. 13. The depth of this notch 2Oa is governed by raising or lowering the cutting wheel 30 by means of the posts 35. When the cutting of the notch 20a, as to depth in respect to the outer face of the ring, is complete, the movement of the bed 27 is stopped and the face plate 41 rocked on its axis by means of a handle 44 into a position, as sho-wn by broken lines in Fig. 5. This rocking of the face plate again feeds the ring to the cuttingl wheel 30, which continues the cutting of the notch 20a completely across the inner face of the ring to the other side thereof, as shown by full lines in Figs. 6 and 13. This last action of the cutting wheel 30 produced by rocking of the face plate 41, transversely cuts the inner face of the ring from the notch 20EL to the opposite side of the ring on an arc of a circle which extends from the outer face of the ring vat the bottom of said notch to the opposite side of the ring in which said notch 2Oa is out. The axis of the arc cut during the rocking movement of the face plate 41 is aligned with the axis ofthe pivot ofsaid face plate. The ringisl then removed from the face plate 41, turned other side up and again secured to said face plate, with one side of the cutting wheel 30 aligned with one sideof the notch 203. The bed 27 and face plate 41 are then operated in succession to cut a second notch 20ZL in the opposite side of the piston ring and circumferentially odset in respect to the first notchf The very act ofv'completing the second notch 201L severs `the ring vbetween the two reduced ends 21. l

`The ring 20 is then secured to the yfaceplate 67, as previously described, and one end thereof is held offset from` the other by the lug 73 to afford clearance for the milling tool 65. The feed screw 28 is then operated to move the bed 27 ltoward the front of the machine to carry thering laterally toward the milling tool k65 to cut, in one of its longitudinal edges, one of the seats 22, as shown in Fig. 15. The yradius of the milling tool 65 is substantially the same as the radius of the arc .on which the inner surface of one of the ends 21 is formed and thereby forms a seat 22, which is completely transversely filled by one of the ends 21 when the ring is compressed. then reversed on the face plate 67 and the other seat 22 cut therein in a like manner.

Referring now lin detail to the modifica-l tions shown in Figs.y 17 and 18, the slide 42, which in this instance is made in two sections, is mounted in aflanged .head 463 on one end of a horizontal fshaft 84 mount.

ed in bearings 85 on the 4bed 27. The sections of the slide 42 are held in the head S8 for vertical and horizontal adjustments by set screws 86. Gbviously, the horizontal shaft 84 permits the required swinging movement of the face plate 41 in feeding rings tothe cutting wheel 30 from the curved `innner surfaces on the ends 21 thereof.

The improved process of forming piston rings consists, first in forming an endless ring having a circumference greater than required when the piston is complete, second in cutting a notch in one side of the ring and extending the same on the arc of a circle which extends from the outerface of the ring at the bottom of the notch across the inner face of the ring to the opposite side thereof, third in forming a like notch in the other side of the'ring circumferentially offset from the first notch with its.'

lap when the ring is compressed, and fourthv in forming seats with transversely curved bottoms 1n the circumferential outer edges The ring is of the ring to receive the reduced ends of the ring when compressed.

What l' claim is: v n

l.. A machine for forming piston rings comprising a tool having a peripheral cutting surface, and a face plate for holding a piston ring With one of its ends substantially tangential to the of the tool. 2. A n'iachine for 'forming piston rings i0 comprising a tool having a. peripheral cutting surface7 a face plate' for holding a piston ring with one of its ends substantially -tangential to the axis of the tool, and means for feeding the face plateto move the pis'- ton ring axially toward the cutting surface of the tool. Y

3. The structure defined in claim l in further combination with means vfor holding one of the ends lof thepiston ring laterally zoofl'set in respect to the other. A el. The structure defined in cla-iin 2 in further combination with means for causing the tool to stop its cutting action on the piston ring at the transverse center of its periphery.

5. The structure defined in claim 2 in further combination withv an adjustable stop for the face plate to' limit the. cutting action of the tool for piston rings of different 3o' Widths.

6. The structure defined in claim 2 in fun ther combination with means for adjusting the piston ring radially` in respect to the cutting surface of the tool.

7. The structure defined in claim 2 in further combination with means foradjusting the piston ring axially in respectto the cutting surfacel of the tool. a

S. The structure defined in claim 2 in 40 further combination with means for adjusting the piston ring both radially and axially in respect to the .cutting surface of the tool.

9. A machine for forming' piston-rings comprising a tool having a peripheral cutting surface, an oscillatory face plate, the axis of which is substantially parallel to the axis of the tool, means for securing a piston ringto the faceplate with its periphery substantially tangent to the axis of the 'face plate, said face plate being movable from one position to another to carry the piston ring held therein in snchrelation to the tool as to cause said tool to cut a quarter round surface on the piston ring transversely thereof.

1 0. The structure defined in claim 9 in which the axis of the face plate maybe adf justed in a plane parallel to a plane inter secting the axis of the tool to move the face plate in suchrelation to the tool as to-cause the same to cut a surface on the piston ringthat is vsubstantially tangential to the quarter round surface. 1

1l. The structure definedin claimv 9 in which the face plate maybe bodilyadjust ed, in respect to its axis, in a plane that is parallel to afplane intersectingits axis.

l2. rlhe structure defined in claim 9 in ywhich the face plate maybe bodily adjusted, in respect to its axis,'at right angles to a plane intersecting its axis. f

i3, The structure defined in claim. 9. vin which the face plate maybe bodily adjusted, in respect toits axis, in a plane that is par allel to a plane 'intersecting its axis and at right angles to said plane. v

lll. A machine for forming piston rings comprising a tool having a peripheral cutting,` edge, an oscillatory face plate, the axis of which is substantially parallel to the axis of the tool, means for securingl a piston ring;` to the face plate with its periphery substantially tangentto the axis of lthe face plate and extending` tangentially away from the'` tool, said face plate being movablel to swing the piston 'ring substantially on the axis thereof.

l5. The structure defined in claim let in which the face plate may be moved to swing the piston ring substantially on the axis thereof and into a position in which the tool extends within the piston ring..

16. The structure defined in vclaim 14 in which the tool may be adjusted radially;

17. A machine for forming piston rings comprising an oscillatory bracket, a Vtool journaled on the bracket and having,r a peripheral cutting surface, an oscillatory face plate, the axis of which is substantially at the axis of 'the tool, means for securing api?- ton ring` to the face plate with its periphery substantially tangent to the axis of the face plate and extending tangentially away from the tool, said face plate being movable to swing the piston` rinp substantially at the axis thereof and into a position in which the free end of the bracket and thertool extend within the piston ring.

18. The structure defined in claim 17in which the bracket isadjustable to radially move the tool.

In testimony whereofl affix my signature.

HENRY R. snirnnr..

Cil 

